Disc tumbler cylinder lock and key combination

Abstract

The rotation limiter disc elements of a disc tumbler cylinder lock-key-combination are arranged to be rotated by a key. The rotation limiting elements have no pieces non-rotatably attached to the inner cylinder. The rotation limiter disc elements are composed of a frame piece and a limiter piece. The frame piece is a circular disc having an opening in the middle of the disc. The opening extends up to the border of the disc widening towards the border, and to the section on the wider side of the opening is disposed a limiter piece. On the inner surface of the inner cylinder is a recess at the site of the limiter disc elements. The key has at least one bevel-edged cavity.

The invention claimed is: 
     
       1. A disc tumbler cylinder lock-key-combination, the disc tumbler cylinder-lock of which combination comprises an outer cylinder and to be rotated inside the outer cylinder, an inner cylinder having a disc pack, which comprises tumbler discs provided with a central opening and a peripheral cavity, and spacer discs, which spacer discs separate the tumbler discs from each other, and central openings form a uniform canal having a guide element, which comprises two rails,
 which inner cylinder further has rotation limiter disc means, which are in connection with the guide element, and a locking bar, which, when the lock is in a locked position, is located partially in the groove in the outer cylinder and partially in a gap in the inner cylinder, which tumbler discs are rotatable by a key of the combination into a position, in which the peripheral cavities are at the site of the gap of the inner cylinder forming a uniform groove, into which the locking bar is able to move by the rotation of the key, wherein the limiter disc means are composed of a frame piece and a limiter piece, which frame piece is an annular disc having an opening in the middle of the disc, which opening extends up to a border of the disc widening towards the border and to the wider portion of the opening, on a side of said border, is disposed a limiter piece, and on a bottom of which opening is additionally a recess for the first rail of the guide element, and the first side of the opening forming a sliding surface, along which the limiter piece is able to slide as the key is rotated from the locked position of the lock, 
 which limiter piece comprises a first projection, a second projection and a third projection, the third projection being towards the bottom of the opening of the frame piece, the second projection being in an opposite direction as the third projection, and the first projection being transversely away from the third and second projections, between which third and first projections is a recess for the second rail of the guide element, a border surface of the second projection being wider than a width of the gap of the inner cylinder and each side edge of an end of the third projection being bevelled, 
 on an inner surface of which inner cylinder is a recess at the site of the rotation limiter disc means for the second projection of the limiter piece, and which key has at least one bevel-edged cavity for the end of the third projection, a gradient of the bevelled edge corresponding to a gradient of the bevelled side edges of the third projection, the limiter piece and frame piece being rotatable in relation to the inner cylinder as the key is rotated. 
 
     
     
       2. The disc tumbler cylinder lock-key-combination according to  claim 1 , wherein the tumbler discs are provided with a peripheral projection and the inner cylinder has a section on a given sector, in which section the peripheral projections are located limiting the rotation of the tumbler discs in relation to the inner cylinder, the sector formed by the border of the frame piece being larger than the sector formed by the section such that the frame piece remains in the inner cylinder regardless of the position of the key. 
     
     
       3. The disc tumbler cylinder lock-key-combination according to  claim 1  wherein on a side of the first side of the opening is the first projection of the frame piece and on a side of an other side of the opening is the second projection of the frame piece, in an end of which first projection is a locking bar recess on the side of the border of the frame piece. 
     
     
       4. The disc tumbler cylinder lock-key-combination according to  claim 3 , wherein the third projection of the limiter piece, a side on the side of the border is a counter sliding surface against the sliding surface formed by the first side of the opening of the frame piece, and a side of the first projection of the limiter piece on the side of the border is a curved support surface against the inner surface of the inner cylinder. 
     
     
       5. The disc tumbler cylinder lock-key-combination according to  claim 4 , wherein ends of the border surface of the second projection are curved. 
     
     
       6. disc tumbler cylinder lock-key-combination according to  claim 5 , wherein a thickness of the frame piece and limiter piece discs is greater than a thickness of an individual tumbler disc. 
     
     
       7. The disc tumbler cylinder lock-key-combination according to  claim 6 , wherein a cavity of the key is longer in the direction of the shaft of the key than in relation to a shaft of the key in a transverse direction. 
     
     
       8. The disc tumbler cylinder lock-key-combination according to  claim 7 , wherein a surface of the first projection on the side of the opening of the frame piece comprises a canal surface towards the bottom of the opening. 
     
     
       9. The disc tumbler cylinder lock-key-combination according to  claim 8 , wherein a surface of the first projection of the limiter piece on the side of the opening of the frame piece further comprises a first beveled surface and an end of the second projection of the frame piece comprises a correspondingly second beveled surface such that it faces towards the first beveled surface. 
     
     
       10. The disc tumbler cylinder lock-key-combination according to  claim 9 , wherein the edges of the sides of the limiter piece are rounded. 
     
     
       11. The disc tumbler cylinder lock-key-combination according to  claim 10 , wherein profiles of the recesses of the frame piece and the limiter piece correspond to profiles of the rails of the guide element. 
     
     
       12. The disc tumbler cylinder lock-key-combination according to  claim 1 , wherein a bottom of the cavity of the key and a surface of the end of the third projection are planar. 
     
     
       13. The disc tumbler cylinder lock-key-combination according to  claim 12 , wherein a depth of the cavity of the key is greater than a reach of the third projection into the cavity of the key. 
     
     
       14. The disc tumbler cylinder lock-key-combination according to  claim 13 , wherein a gradient angle of the edges of the cavity of the key and of the bevelled side edges of the third projection is 45 degrees or approximately 45 degrees.